Why does my baby hate sleeping on her back? She is 8 weeks old and I've tried to lay her on her back in her pack n play and her crib to sleep and she just grunts and squirms all night long...she currently sleeps great at night in her rock n play then naps in her bouncer during the day, Ive been trying since day 1 to have her on her back and she hates it, anyone else?! Doesn't matter if she is swaddled either.